Created attachment 1257 [details]
Mods to the UanPhyGen::SetSleepMode method

Hello,

There is a problem with the UanPhyGen::SetSleepMode (bool) method, when called in the middle of a Tx. Suppose the following:

- The Phy layer is in the middle of a Tx.
- For some reason, the upper layer calls SetSleepMode with the bool parameter set to false. This will change the m_state variable from TX to IDLE.
- When the transmission finishes, an error will be thrown at TxEndEvent line 558 since m_state has changed.

I propose checking the m_state variable before changing the state.

Another problem comes with the wakeup procedure. When the phy layer wakes up it starts at the IDLE state. Instead, I think the channel should be listened first and switch to the CCABUSY state if appropriate.

I'm attaching a patch with the modifications.